13.01.2016
Offset printing technology is preferred method for printing materials providing lower per-unit costs with the quality for larger print runs.
Level of sales in the printing business based on UV technology has increased globally three times compared to the competition from conventional offset. UV technology represents the biggest degree of quality, and when is used in inline, process is efficient, consistent and just as harmless as the conventional offset printing in terms of health if we follow all the instructions and measures of safety. However, it is not possible to overcome UV printing and coating technology in a simply steeps. UV printers need to collect experience, manage expenses of investment and expenses of materials and energy, they must plan time of amendments and preparation time for machine between operations with conventional and UV colors, as well as to adjust printing parameters. For creating dry coated film on printed material UV varnish are using UV radiation from which their name is coming. Radical is at the inks and varnishes based on acrylic and these are mainly used UV varnishes. Drying is carried out in a manner that photo initiators under the influence of UV radiation decompose into chemically highly reactive radicals that initiate networking of monomers in a strong plastic film. For more expensive, cationic substances, which are mainly UV varnishes based on epoxy resin, a one single pulse is enough to trigger the process of drying i.e. Since UV inks and varnishes harden in a split second using UV radiation in the printing press, sheet can be instantly forwarded to next process of post press operations and film thickness shows high resistance to mechanical influences such as the scraping and scratching. But their biggest plus is the possibility of printing on non-porous substrates such as synthetic, plastics or metallic papers. The offset printing inks used on an offset printing press must be able to carry the full-intended color and covering power to the paper despite the split-film action. VEHICLE: Vehicle is the liquid that holds the particles of pigment and carries them to the paper.
MODIFIERS: Modifiers are ingredients added to the ink to control drying and other qualities such as smell and resistance to fading.
Visual properties of inks are a function of the colorant or pigment, in relation to the vehicle system used. When we refer to ink color, we are most often speaking of hue or shade—whether the ink is red or blue or green or purple. Gloss – refers to an ink’s own ability to reflect light, and depends upon the lay or smoothness of the ink film on the substrate surface. Temperature stability – in an ink is important in allowing it to withstand the heat generated by the friction that occurs as the ink moves through the rotating rollers and cylinders.
Tack – refers to the stickiness of the ink, and it must be correct so that the ink will stick to the rollers of the press and not fly off, but still transfer from roller to roller, from roller to plate, from plate to blanket, and from blanket to paper. PANTONE MATCHING SYSTEM: The PANTONE MATCHING SYSTEM (PMS), consist of swatch books that contain samples of hundreds of different colors, each identified with a code number and the formulation for each color.
PERMANENT: Permanent inks maintain their color and do not fade even though exposed to sunlight for long periods.
FUGITIVE: A fugitive ink is one that tends to lose its color and fade when exposed to long periods of sunlight. RESISTANT: Resistant inks are made to withstand the action of gases, chemicals, heat, moisture, or scuffing. HALFTONE BLACK: Halftone black ink is made especially made for printing the small dots in halftones. By employing these premium UV inks, Durst users will be able to offer 3M MCS Warranty Certified graphics upon completion of the certification process. The combination of Durst’s world-renowned innovation and durability with the added backing of a 3M MCS warranty will elevate roll-to-roll productivity and reliability to a new level, the companies said.
Mimaki USA has announced the UJV55-320 super wide format UV-LED printer, a 128-inch roll-to-roll model featuring seven ink colors including white for printing on transparent or colored media.
Large indoor backlit signs are commonly used at airports, transit stations and commercial facilities. The UJV55-320 printer will be available in US, Canada, and Latin America beginning in April 2016.
Because UV varnishes does not contain harmful organic solvents they are use more and more especially in the U.S. Besides that printed materials varnished with UV coatings have a much better and smoother fingerprints touch. Huge range of non-absorbent substrates that can be printed with UV inks and varnishes becomes great challenge for creative designers in print of packaging and labels. Also, because of aggressive photo initiator in these inks must be careful not to come in contact with skin and especially not to put them under the sun because UV radiation stimulates reaction. If we talk about the disadvantages, then they are essentially costs of investments in this technology that is the high and high costs of materials and energy, because UV lamp consumes large amounts of electricity. They must be able to withstand reaction with the press fountain solution it encounters on the dampened offset plate. This occurs because the offset blanket picks up only a portion of the ink from the plate and delivers only a portion of that to the paper.


Inorganic pigments, which are made by mixing various chemicals together, are used for colored inks. Sometimes, an ink with little opacity is needed, such as when overlapping two colors to create a third color. A transparent ink does not hide the color beneath it, but mixes with it to create a third color. Generally, the higher the ratio of vehicle to colorant, the smoother the lay, and the higher the gloss. It applies to the trouble-free interaction between the ink and the press, the paper and the press, and finally, the ink and paper. If an ink vehicle is not sufficiently stable, the increased temperature can have a deleterious effect on an ink’s body and therefore on its runnability.
Long inks flow well but form long filaments that have a tendency to sling or mist, especially on high-speed presses. The most obvious is that a printed piece cannot be handled or used until the ink has developed film integrity. If the customer orders black ink, there are few problems because black is essentially black.
In other words, the book tells exactly how much yellow and how much blue are required to make the specific color of yellowgreen ink the customer chose from the book.
It will be on display at various worldwide expositions including in the Mimaki USA booth 1770 at the upcoming International Sign Expo, April 21-23, in Orlando. Instant-curing UV inks enable multi-layer printing that reproduces high-quality designs with two-layer or three-layer printing. This method of visual communications is gaining favor due to the use of long-lifetime and energy-efficient LEDs and a shift toward environmentally conscious advertisements. This model offers fast print speeds of up to 1184 square feet (110 square meters) per hour. Because they don’t contain liquid substances the whole amount of varnish will polymerized as a hard film on the surface of printed material. In cases where the UV-varnish is applied over the conventional offset ink on which first is printed primer is required in to examine the need for the use of powder. Ideally, the ink on the ink roller should not absorb water (water-in-ink emulsification), nor should the ink break down and combine with the fountain solution on the non-printing areas of the plate (ink-in-water emulsification). The film of ink reaching the plate, then, is very thin, and the ink must be able to show its full color and opacity with this film. For example, sulfur, silica, or china clay can be combined with either soda ash or sulfate salts to make ultramarine blue ink.
For example, phenol and formaldehyde mixed together make phenolic resins, sometimes used in printing inks as a vehicle.
Application of a thicker ink film tends to improve gloss while penetration into the substrate tends to reduce. Body, temperature stability, length, tack, adhesion and drying all contribute to the runnability of an ink and are primarily a function of the vehicle system used in the ink.
In addition, however, the way an ink dries can reduce air pollution, improve energy efficiency, and even improve productivity in the pressroom by allowing faster printing and converting.
However, if the customer orders yellow-green, it is hard to know exactly what color yellow green she has in mind.
Printers can obtain these books so they can order the exact color the customer wants.The printer may also use this book to mix ink colors in the plant. If it refuses to pour at all, it has a high viscosity.Offset inks usually have a relatively high viscosity. This model is also equipped with an LED light for checking backlit signage during printing, which gives operators the ability to immediately verify density, thereby reducing waste and improving production efficiency.
Since UV-curable inks do not contain volatile organic compounds (VOCs), they’re ideal for creating signs with a low environmental impact.
It is also fully networkable with industry standard Gigabit Ethernet for multiple printer connections over greater distances ensuring the highest productivity. Compared to other inks such as solvent, UV-curable inks are thicker and maintain vibrancy when used for backlit signage.
This technology offers high gloss of printed materials and increases the range of printing surfaces who can be used and therefore is used particular in order for achieving better design and improving the selling of graphic products. Photo initiators will let start-up reaction of connecting of molecules like in the net under the influence of UV radiation .UV varnishes without the effects of UV radiation remain in fluid and therefore will not get dry on the rollers. Either of these emulsification problems will tend to impair the body, color, or drying qualities of the ink, or cause tinting on the non-printing areas of the plate and printed sheets. Then come cyan, magenta and yellow which are used in process printing to create the millions of colors so familiar to us in printed matter. The amount of pigment used affects an ink’s color strength, and the type of vehicle used can affect both the hue and the value of the ink color.
The choice of colorant and the degree to which it is dispersed through the vehicle are the most important factors in determining the transparency or opacity of an ink.


In most cases, the first phase of ink drying is setting; immediately upon being applied to the stock, the liquid portion of the ink begins to evaporate into the air or to penetrate the stock, causing the ink to thicken. To help solve the problem of mixing the exact color the customer wants, the ink manufacturing industry has developed a system of color classification know as the PANTONE MATCHING SYSTEM. The PANTONE MATCHING SYSTEM relys on ten basic colors (PMS black, PMS white, PMS rubine red, PMS rhodamine red, PMS warm red, PMS reflex blue, PMS process blue, PMS green,PMS purple and PMS yellow) which can be kept on hand and mixed using the roportions indicated in the PANTONE book to make the exact color desired. This dual-roll capability can double the productivity of a shop, with both rolls printing the same set of graphics, or completely different jobs.Mimaki Proofing Panel (MPP) for instant print quality checks.
The UJV55-320 supports a variety of uncoated media that does not require drying time so prints can be finished immediately after printing. While the physics of color is a highly sophisticated science, in simplest terms color comes from reflected light. The color of the vehicle itself, its ability to wet the pigment articles, and even the chemical interaction between the vehicle and pigment can affect the shade or purity. Opacity is tested by spreading a sample of ink with an ink knife over a wide black line printed on a sheet of paper.
Setting is followed by actual drying via one or more possible mechanisms: absorption,  oxidation, evaporation, or polymerization.
Beside quantities of the basic colors listed above, the printer must also have an accurate scale to measure the quantities of ink required for the color, ink mixing knives, clean-up solvent, and rags.
An LED backlit-proofing panel gives the operator the ability to check the color fidelity during printing and react immediately to a misprint, which can help reduce waste and improve production efficiency. Often, only colored inks are used for multi-layer printing to increase opacity but that process results in a darker appearance when used in a reflective (daylight, not backlit) environment. The amount of covering is then compared to a standard to determine if the opacity is correct.
The specific mechanism is determined by the relationship between the printing process itself, the ink vehicle system, and the substrate. To mix the inks, the exact amount of each required PMS basic color is measured out on the scale (use only PANTONE colors for acceptable results).
The white layer (color + white + color) ensures color fidelity for backlit and double-sided signs during both day and night.
When that light passes through a filter or is separated by a prism or raindrop we see the individual colors in the light spectrum.
Inks that are applied to an absorbent substrate such as newsprint or corrugated board dry by absorption. The UJV55-320 printer uses Mimaki original LUS-120 UV-LED inks available in cyan, magenta, yellow, black, light cyan, light magenta and white. The liquid portion of the ink penetrates the substrate, leaving an ink film on the surface. The ink is then tested for correct color and, if it is correct, it is placed in cans for use later or put directly into the press fountain.
With a quick visual check, the operator can easily assess the print quality under similar conditions used for backlit signage.
LUS-120 UV-LED inks also offer excellent scratch resistance provide up to 170% flexibility making them ideal for foldable and easy-to handle-banner applications. Because printed surfaces vary in color and in reflectance, they, too, will affect the reflected color.
Depending upon the printing process, this ink film may undergo additional drying procedures.In oxidation, components in the ink’s oils chemically combine with oxygen in the atmosphere to form a semisolid or solid ink film. Thus, various ink colors printed individually or “trapped” one on top of the other create different filter effects resulting in different visible colors. Similarly, these same ink colors printed on different substrates will result in visible colors that are different yet. Oxidation can be  accelerated by the use of driers in the ink formulation or by the application of heat or infrared radiation to the printed piece. In the former, vehicle solvents evaporate, leaving resins and other materials behind to bind the pigments to the substrate. Evaporation from the inks must be rapid enough for complete  drying, but not so rapid as to cause instability while the inks are still running on press. In radiation curing, all of the components in the ink remain on the surface of the substrate, but are polymerized into a hard film by the use of ultra-violet light or electron beam energy to trigger a chemical reaction. UV-curable inks require the presence of a photo-initiator, while EB-curable formulations do not.



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